Help with a regular expression

Hi,

I'm trying to match a series of terms in a boolean expresion like this:

medicinal AND clinical AND behavoiural

I made this regular expresion, and I cannot understand what am I doing wrong, since it matches the whole sentence, but it only gathers the first and the last terms...

([\S]+)( AND ([\S]+))+

Matches:

Group(0) = medicinal AND clinical AND behavoiural

Group(1) = medicinal

Group(2) = AND behavoiural

Group(3) = behavoiural

Any suggestions ??

Thanks in advance.

What is your result supposed to be like?

(?-s)(?i)(?-m)(?-x)(?n)((?<word>\w+)\s+(?=(?<boolean>AND|OR)))|((?<=(?<boolean>AND|OR))\s+(?<word>\w+))